A method for detecting, processing and diagnosing abnormal heating of a cable terminal in a running state

Abstract

The invention discloses a method for detecting, processing and diagnosing abnormal heating of a cable terminal in an operating state, comprising: 1) building an abnormal heating detection and processing device, which uses a single-chip microcomputer control module to process eight temperature sensors collected by a temperature signal acquisition system Monitor the temperature data of the insulating layer of the cable terminal to control the work of 10 cooling fins and alarms fixed in the temperature control shell; 2) test the abnormal heating of the cable terminal; 3) diagnose the abnormal heating degree of the cable terminal and use temperature signal collection The system stores the temperature data of 8 temperature sensors within 1 minute of abnormal heating of the cable terminal, and calculates the abnormal heating factors of the 8 cable terminal insulation layer test points and the overall heating damage factor of the entire cable terminal. The method can detect and deal with the abnormal heating of the cable terminal, and can accurately determine the heating damage of the cable terminal when the abnormal heating of the cable terminal cannot be effectively reduced.

Description

technical field [0001] The invention belongs to the field of cable terminal faults in electrical systems, and in particular relates to a method for detecting, processing and diagnosing abnormal heating of a cable terminal in a running state. Background technique [0002] In recent years, with the rapid development of urban power grids, cables are widely used due to their good insulation and corrosion resistance; cable terminals are an important part of cables, connecting cable bodies and other terminal equipment, due to their special functions, their Compared with the cable body, the structure is relatively special, and the production quality requirements are relatively high. There are various defects inside it, and it is operated under high voltage and high current conditions for a long time, which makes the internal electric field distribution uneven, and local overheating or overall abnormality often occurs inside. Heat generation will easily lead to carbonization of each...

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Problems solved by technology

[0003] As we all know, the structure of the cable terminal is relatively complex, and the distribution of the thermal field is relatively uneven, so it is often difficult to obtain its temperature distribution; and currently there are relatively few temperature monitoring and processing methods for the cable terminal, and the heating condition is generally judged by monitoring the temperature of its surface, but This method cannot effectively monitor the temperature distribution inside the cable terminal in real time, nor can it provide effective treatment and protection. Therefore, there is an urgent need for a more effective and controllable method to detect the temperature inside the cable terminal and to effectively perform temperature control. , at the same time, in the case that this method cannot effectively control the temperature, it is necessary to diagnose the abnormal heating of the cable terminal based on the temperature data, and judge the abnormal heating degree of the cable terminal, which has great engineering value for the safe and effective operation and maintenance of the future power grid and theoretical significance

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